According to one study, the average college football player sustains a whopping 950 to 1,100 sub-concussive blows per season—hits that are enough to do cumulative damage to young brain tissue but not enough to cause immediate symptoms. There are speculated numbers that say there are around 1,700 concussions sustained in the NFL each year. The investigator explained, "After a certain number of hits, the damage starts to show." According to studies conducted by the NFL’s Committee on Mild Traumatic Brain Injury a concussion in professional football involves a mean impact velocity of 9.3 m/second (20.8 mph) and a head velocity change of 7.222 m/second (16.1 mph). The Committee actualized the severity of this finding by comparing car accidents, stating car accidents typically “involve impact durations of less than 6 m/sec for head